LibGfx/TIFF: Override ImageDecoderPlugin::metadata()

Author: https://github.com/LucasChollet
Commit: 383be5e49c
Pull-request: https://github.com/SerenityOS/serenity/pull/22483
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/nico

Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.h

@@ -36,6 +36,7 @@ public:
 
     virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
 
+    virtual Optional<Metadata const&> metadata() override;
     virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;
 
 private: